Does Tesla Motors have central parts database?

Unfortunately, I've had a few times in my 1.5 years of owning two Teslas where parts were needed, and sometimes they took quite a while to locate and arrive. It's been something I seem to notice when reading the forums, too. And after speaking with a Tesla-certified body shop and maybe a dozen people in person who've had the same situation, it seems that the system for finding a part is that Tesla basically has to spend weeks calling every service center to track one down. They call every service center until a part is tracked down, and then have it shipped where it's needed. They don't seem to have a database of what service centers have what parts in stock. This can't be true, right? Surely a silicon valley company with millions of parts must be uber-organized with respect to inventory? I am not bashing Tesla, I'm just baffled by my (and others') experience with parts suppy. And, as with any concern, I'm uneasy about how this is going to affect the massive uptick in ownership that's coming our way. This is obviously a separate concern from the lack of service center bays and repair facilities we're already dealing with as customers.